part of human heart reseves oxygenated blood
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The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium.
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Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium.
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